Jet Tomography of Hot and Cold Nuclear Matter

Details Jet Tomography of Hot and Cold Nuclear Matter Jet Tomography of Hot and Cold Nuclear Matter

2002-02-12

arxiv.org/abs/hep-ph/0202105v3

Phys.Rev.Lett. 89 (2002) 162301

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages in RevTex with 3 ps figures, final version published in Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.89.162301

Medium modification of parton fragmentation functions induced by multiple scattering and gluon bremsstrahlung is shown to describe the recent HERMES data in deeply inelastic scattering (DIS) very well, providing the first evidence of $A^{2/3}$-dependence of the modification. The energy loss is found to be $ \approx 0.5$ GeV/fm for a 10-GeV quark in a $Au$ nucleus. Including the effect of expansion, analysis of the $\pi^0$ spectra in central $Au+Au$ collisions at $\sqrt{s}=130$ GeV yields an averaged energy loss equivalent to $ \approx 7.3$ GeV/fm in a static medium. Predictions for central $Au+Au$ collisions at $\sqrt{s}=200$ GeV are also given.

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